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Paleoseismic and Slip-Rate Observations along the Honey Lake Fault Zone, Northeastern California, USA

R. Turner,^* R. D. Koehler, R. W. Briggs, and S. G. Wesnousky

Center for Neotectonic Studies, University of Nevada, Reno, Nevada 89557

^* Present address: William Lettis and Associates, 1777 Botelo Drive, Suite 262, Walnut Creek, California 94596.

Present address: California Institute of Technology, Tectonics Observatory, MS 100-23, Pasadena, California 91125.

Online Material: A photomosaic of the Honey Lake fault zone exposure.

The Honey Lake fault is a major strike-slip fault in northeastern California that accommodates northwest-directed right-lateral shear in the northern Walker Lane. We reexamine the fault’s paleoseismic history and slip rate by evaluating a natural stream bank exposure of the fault and offset terrace riser. Structural and stratigraphic relations within the modern stream cut, radiocarbon ages, and a detailed topographic survey of the offset terrace riser are used to estimate a Holocene fault slip rate of 1.7–0.6 mm/yr or more. We also interpret the occurrence of at least four surface-rupturing earthquakes during the last 7025 calendar years before present (B.P.). Three of the surface-rupturing earthquakes occurred prior to 4670 calendar years B.P. and have interevent times that range between 730 and 990 yr. The stratigraphic record is limited after 4670 calendar years B.P., and records evidence for at least one more subsequent surface-rupturing earthquake.